53
DRAINING THE WATER HEATER
Solar Storage Tank
Warning: Exercise care, as water discharged from the solar storage tank may be of a very high
temperature.
To drain the solar storage tank:
Turn off the water heater (refer to “To Turn Off The Water Heater” on page 52).
Close all hot water taps.
Operate the relief valve release lever - do not let the lever snap back or you will damage the valve seat.
Operating the lever will release the pressure in the water heater.
Undo the union at the cold water inlet to the solar storage tank and attach a hose to the water heater side
of the union.
Let the other end of the hose go to a drain.
Operate the relief valve again.
This will let air into the water heater and allow the water to drain through the hose.
Heat Exchanger
Warning: Exercise care, as fluid discharged from the heat exchanger may be of a very high temperature.
To drain the heat exchanger:
Switch off the electrical supply at the power outlet to the water heater.
Remove the lower front cover from the solar storage tank.
The solar monitor located on the lower front cover is connected to the solar control module by a ribbon
cable. The ribbon cable has sufficient length to enable the removal of the lower front cover and for it to be
set to one side of the opening without disconnecting the ribbon cable from the solar control module.
The ribbon cable can be disconnected from the solar control module if it is necessary to remove the lower
front cover completely from the work area in front of the solar storage tank.
At the completion of this procedure, if the ribbon cable from the solar monitor has been disconnected,
reconnect it to the solar control module prior to replacing the lower front cover.
Attach a 12 mm (½”) diameter clear hose to the heat exchanger drain valve hose tail connection (refer to
step 5 of “Attach Closed Circuit Fluid Level Hose” on page 43).
Disconnect the drain line from the solar circuit relief valve at the top of the solar storage tank. Remove the
spring clip from the solar circuit relief valve and remove the valve.
Warning: The solar circuit may be under pressure. Take care when removing the solar circuit relief
valve, as a sudden discharge of pressurised hot vapour may be experienced. This discharge will create a
sharp sound of vapour being released.
Open the heat exchanger drain valve and remove the plug from the end of the hose.
The closed circuit fluid will flood the hose.
Place the end of the hose into a container and drain the closed circuit fluid from the heat exchanger.
Note: The heat exchanger can contain up to 16 litres of closed circuit fluid. A suitably sized container
should be used to accommodate this amount of fluid.
The closed circuit fluid contains food grade additives (rust inhibitor, anti-freeze agent, colour) and is
harmless to the environment. However, it is good practice to recover any excess closed circuit fluid and
remove from site for appropriate disposal.
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